All single-displacement reactions can be classified as another type of reaction as well. what type of reaction is that?

a) combustion
b) redox
c) synthesis
d) decomposition

The single displacement reaction can be classified as redox

Explanation:

A simple substitution reaction or simple displacement reaction, called single-displacement reaction, is a reaction in which an element of a compound is substituted by another element involved in the reaction. The starting materials are always pure elements and an aqueous compound. And a new pure aqueous compound and a different pure element are generated as products. The general form of a simple substitution reaction is:

AB + C ⇒ A +BC

where C and A are pure elements; C replaces A within compound AB to form a new co, placed CB and elementary A.

A single-displacement reaction is characterized by a place of exchange of cations or anions with another to form a new product. A begins as an ion in the solution and appears elementally in the reaction products. In case of reagent C it starts in its elemental form and ends as an ion in an aqueous state forming compound BC.

On the other hand, oxidation-reduction reactions or redox reactions are those in which an electron transfer occurs between the reagents. An electron transfer implies that there is a change in the number of oxidation between the reagents and the products.

The gain of electrons is called reduction and the loss of electrons oxidation. That is to say, there is oxidation whenever an atom or group of atoms loses electrons (or increases its positive charges) and in the reduction an atom or group of atoms gains electrons, increasing its negative charges or decreasing the positive ones.

The redox reaction is a single-displacement reaction.  A chemical substance goes from being an ion to a pure element. The oxidation state of a monoatomic ion in solution is equal to its charge, while the oxidation state of a pure element is equal to zero. Any element that goes from being an ion to a pure element or vice versa must be changing oxidation state.

A displaces C, which can be the H₂ molecule or another metal. If C is formed by the reduction of ions, then species A, by the conservation of mass and energy and must provide electrons: it must oxidize.

On the other hand, if A and C are metallic species, but C is in the ionic form (M+) and A in its natural state, then the displacement reaction will occur only if A is more active than C, forcing the latter to Accept the electrons to reduce to their metallic state (M).

So finally, the single displacement reaction can be classified as redox.

yes it is balanced

1. they vary with a higher number because boiling is way hotter than melting